Cutter for mining-machines



No Model.)

B. E. CARTER. CUTTER FOR MINING MACHINES.

No. 409,138. Patented Aug. 13, 1889.

FIG-3.2. FIG-L3. 2 2, 2, 2

WESESS: INVENTOR,

ma add; a @M an, 52% m 1% UNITED STATES PATENT OFFICE.

EDI/VIN E. CARTER, OF ALLEGHENY, PENNSYLVANIA.

CUTTER FOR MINING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 409,138, dated August 13, 1889. Application filed June 5, 1889. Serial. No. 313,151. (No model.)

To all whom it may concern:

Be it known that I, EDWIN E.'CARTER, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have inven ted or discovered a certain new and useful Improvement in Outters for lVIining-Machines, of which improvement the following is a specification.

My present invention is an improvement upon that for which Letters Patent of the 'lnited States No. 387,144 were granted and issued to John S. Scully as my assignee under date of July 31, 1888; and its object is to en able the operative advantages of the cutter which forms the subject of said Letters Patent to be attained by a construction which will be simpler and more desirable both as to manufacture and maintenance.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure l'is an end viewin elevation of a cutter embodying my invention, and Figs. 2 and 3 side views taken at right angles one to the other of the same.

In the practice of my invention the cutter 1 is, as in Patent No. 387,144, above referred to, formed from a flat plate of steel and provided with two preliminary cutting-points 2 2, located on opposite sides of an intermediate recess 3, concentric with the axis of the stem or spindle 7, upon and with'which the cutter is carried and rotated. In lieu, however, of employing two lateral cutting-lips each adjoining one of the cu tting-points and a supplemental cutting-lip adjoining one of the lateral cutting-lips and located in a plane be low said lips, as in Patent No. 387,144, I provide in my present invention a single preliminary broad cutting-lip 4, having a cuttingedge substantially perpendicular to the axis of the cutter and extending outwardly from the base of one of the cutting-points 2, and form upon the opposite side of the axis of the cutter a supplemental cutting-lip 5, havinga cutting-edge the outer end of which is located at a greater distance from the axis of the cutter than the outer end of the lip 4, and in a plane slightly below said lip, said edge extending inwardly and slightly downward toward the adjacent cutting-point 2, so that its cutting action shall succeed that of the lip 4 and be exerted through a radial range equal to the difference of distance from the axis of the cutter to the outer end of the lip 4 and to the outer end of the supplemental lip 5, respectively. It will thus be seen that while, as in my former construction, I provide successively in operation a preliminary boring by cutting-points, an enlargement of bore by a lateral cutting-lip, and a further enlargement to maximum diameter by a supplemental cutting-lip, I am enabled to simplify the construction and reduce the weight of the cutter, and facilitate the operation of grinding it when -required, by presenting only a single continuous cutting-edge on each side of its axis.

1 claim as my invention and desire to secure by Letters Patent- A cutter having two cutting-points located at opposite sides of a central recess, a preliminary lateral cutting-lip located in a plane below one of said cutting-points, and a supplemental lateral cutting-lip located on the opposite side of the axis of the cutter, with its outer end in a plane below that of the preliminary cutting-lip and at a greater distance from the axis than the outer end of said preliminary lip, and extending to the base of the adjacent cutting-point wholly below the plane of its outer end, substantially as set forth.

In testimony whereof I have hereunto set my hand.

EDWVIN E. CARTER.

Vitnesses:

R. H. WHITTLEsEY, J. SNowDEN BELL 

